EP0786579A1 - Air motor piston to crank linkage - Google Patents
Air motor piston to crank linkage Download PDFInfo
- Publication number
- EP0786579A1 EP0786579A1 EP97300358A EP97300358A EP0786579A1 EP 0786579 A1 EP0786579 A1 EP 0786579A1 EP 97300358 A EP97300358 A EP 97300358A EP 97300358 A EP97300358 A EP 97300358A EP 0786579 A1 EP0786579 A1 EP 0786579A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- yoke
- crank
- bearing
- pivot link
- piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B1/00—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements
- F01B1/08—Reciprocating-piston machines or engines characterised by number or relative disposition of cylinders or by being built-up from separate cylinder-crankcase elements with cylinders arranged oppositely relative to main shaft and of "flat" type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01B—MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES
- F01B17/00—Reciprocating-piston machines or engines characterised by use of uniflow principle
- F01B17/02—Engines
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/18208—Crank, pitman, and slide
Definitions
- This invention relates generally to air motors and more particularly to a piston to crank linkage for an air motor for a hoist.
- Linked piston air motors utilize one of two well known bearing arrangements for connecting the piston rods to the crank shaft.
- the crank shaft has a single journal to which the rods are connected at the same axial location or, in the case of six piston motors, at two adjacent axial locations.
- the rod ends are segmented so that together they form a complete bearing that encircles the crankshaft journal.
- the segmented rod ends have sufficient clearance between adjacent rod ends to allow the rods to pivot independently and are held against the journal by retaining rings that encircle the outside of the segments.
- one of the connecting rods known as the "Queen Rod” contains a bearing that fits over the crankshaft journal.
- the bearing housing on this rod has a flange around the outside to which the remainder of the rods are pinned.
- the pistons of these motors require sufficient skirt length to prevent them from tipping and jamming in the cylinder bore.
- the ratio of piston length to diameter is usually greater than 0.6, adding significantly to the size and inertia of the moving parts. This results in an air motor that is large in comparison to its power output. Because of the requirement to pin the rods outside of the crank bearing, the "Queen Rod" air motor requires even greater space.
- the yoke must be hardened steel to withstand the wear caused by the bearing scuffing at high speeds.
- An additional bearing arrangement is usually required to prevent the yoke from twisting on its axis which would throw it out of perpendicular alignment with the crank pin.
- an air motor piston to crank linkage comprising a pair of opposed pistons disposed in opposed cylinder chambers for reciprocation therein and interconnected by a open centre rigid yoke having a continuous sided open centre, and a pivot link and a crank; characterised in that there is a crank to pivot link connection rotating about said crank and in the confines of said open centre of said yoke and translating relative to said yoke along an arc segment as defined by said pivot link connecting one of said pair of opposed pistons to said crank connection.
- an air motor for a winch or hoist or the like including a motor body 20 having cylinder caps 21 and 21A installed at opposite ends to form opposed piston cavities.
- pairs of pistons 1 and 1A (or multiple pairs of pistons axially offset and/or radially offset as, for example, 90° for a four cylinder radial motor) are yoked together to provide great bearing length (i.e., the distance between the pistons) but their force is transferred to the crank 15 through a single pivoting link 7 attached to one end of the yoke 25. Since two pistons 1 and 1A share the same link, the number of bearings required for the link is half that of a motor with conventional connecting rods. As in the "Scotch Yoke" arrangement, the pistons require only sufficient length for a seal ring that also acts as a bearing to support the side load.
- the pistons 1 and 1A are linked together by an open center rigid yoke 25.
- the open center 30 provides clearance for the crank pin 10 to rotate in and translate along an arc relative to the yoke 25 as defined by the pivoting link 7 about pin 8.
- the open center or clearance opening 30 is in the form of opposed trapezoidal openings 31 and 31A connected by semicircular bridges 32 and 32A on the top and bottom as shown in Fig. 1 to form a continuous sided opening.
- the yoke is planar.
- the pre-lubricated and sealed bearings 6 and 9 are used to pivot the link.
- the bearings are standard items requiring no further crankcase lubrication. These bearings also act to prevent the yoke from twisting on its axis.
- the yoke 25 and pistons 1 and 1A are cast as a single piece from aluminum or other suitable structural material.
- Each piston includes a plastic seal ring 2 which also acts as a piston support bearing. Seal ring 2 is backed by O-ring 3 to effect resilient sealing pressure on the seal ring and is held on the piston by retaining ring 4.
- Each piston 1 and 1A slideably engages its respective cylinder 5 and 5A. Sealed bearing 6 is pressed into yoke 1.
- Link 7 is pinned through sealed bearing 6 by pin 8 through web 26 of yoke 25.
- Link 7 also contains sealed bearing 9 that engages crank pin 10.
- Sealed bearing 6 is a standard deep groove ball bearing that is pressed into the yoke with sufficient interference to reduce its internal clearance. In this condition the bearing provides a high degree of stiffness to the link to prevent it from twisting and to eliminate any tendency for axial movement on the yoke. When the yoke is assembled with a needle roller bearing 9 engaging the crank pin 10, this stiffness is transferred to the yoke to prevent the entire assembly from twisting on its axis. This permits the connecting yoke and assembly to be manufactured with a minimum axial length piston, minimum yoke depth and minimum adjacent piston offset for multiple radial piston sets, which in turn results in the ability to manufacture compact motors with minimum diameter and axial crank length dimensions. Several pairs of pistons may be arranged in so-called “pancake” form (opposed 2 cylinder, 4 cylinder, 6 cylinder, etc.) or in "radial” form (4, 6, 8 cylinder, etc.).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Transmission Devices (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US590986 | 1996-01-24 | ||
US08/590,986 US5638738A (en) | 1996-01-24 | 1996-01-24 | Air motor piston to crank linkage |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0786579A1 true EP0786579A1 (en) | 1997-07-30 |
Family
ID=24364554
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP97300358A Ceased EP0786579A1 (en) | 1996-01-24 | 1997-01-21 | Air motor piston to crank linkage |
Country Status (3)
Country | Link |
---|---|
US (1) | US5638738A (ja) |
EP (1) | EP0786579A1 (ja) |
JP (1) | JPH09209702A (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002209516A (ja) * | 2001-01-19 | 2002-07-30 | Nisshin Oil Mills Ltd:The | 食用油脂組成物 |
DE10360920B3 (de) * | 2003-12-23 | 2005-09-22 | Meta Motoren- Und Energie-Technik Gmbh | Hubkolbenverdichter |
JP2007534552A (ja) * | 2004-04-29 | 2007-11-29 | マルチネス フランシスコ ヤビエル ルイス | 自走式車両のエネルギー回収装置 |
US20060070812A1 (en) * | 2004-09-24 | 2006-04-06 | Eggleton Jerry W | Battery-operated grease gun |
US20070210659A1 (en) * | 2006-03-07 | 2007-09-13 | Long Johnny D | Radial magnetic cam |
DE102007005228B4 (de) | 2006-08-25 | 2020-07-02 | Grini Miskarov | Motor mit einen im Querschnitt rechteckigen Kolben |
DE102006042122A1 (de) * | 2006-09-07 | 2008-03-27 | Linde Ag | Verdichter |
WO2014081349A2 (ru) * | 2012-11-22 | 2014-05-30 | СУРХАЕВ, Рамзан Саламович | Двигатель внутреннего сгорания |
CA2913846C (en) * | 2014-12-04 | 2022-11-15 | Circle Dynamics Inc. | Connecting rod and piston for an oil-less pneumatic motor |
DE102016001576A1 (de) * | 2016-02-11 | 2017-08-17 | Wabco Gmbh | Hubkolbenmaschine, insbesondere zwei- oder mehrstufiger Kolbenkompressor, Druckluftversorgungsanlage, Druckluftversorgungssystem und Fahrzeug, insbesondere PKW mit einer Druckluftversorgungsanlage |
JP2019516910A (ja) * | 2016-05-17 | 2019-06-20 | ガル・ゴルドナーGal GOLDNER | 圧縮機 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR830293A (fr) * | 1936-12-15 | 1938-07-25 | Tilling Stevens Ltd | Moteur à cylindres diamétralement opposés |
US2310733A (en) * | 1942-03-25 | 1943-02-09 | Duke Charles Austin | Internal combustion engine |
US3200800A (en) * | 1962-04-27 | 1965-08-17 | Bois Francois M Du | Internal combustion engine |
DE2746203A1 (de) * | 1977-10-14 | 1979-04-19 | Bernhard Karl Dipl Ing | Verbrennungsmotor |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US190938A (en) * | 1877-05-15 | Improvement in steam-engines | ||
US545032A (en) * | 1895-08-20 | Condensing- pump | ||
US669290A (en) * | 1900-06-22 | 1901-03-05 | Fredrick Stoer | Engine. |
US947882A (en) * | 1901-09-03 | 1910-02-01 | Gen Electric | Electric air-compressor. |
US887855A (en) * | 1907-04-22 | 1908-05-19 | Reinhold Reichardt | Engine. |
US1386753A (en) * | 1919-12-11 | 1921-08-09 | Baer Walter Charles | Refrigeration apparatus |
US1523790A (en) * | 1922-10-23 | 1925-01-20 | Albert B Pedersen | Air compressor |
US1727049A (en) * | 1927-03-09 | 1929-09-03 | Eugene A Cobb | Compressor |
CH512017A (de) * | 1969-07-04 | 1971-08-31 | Burckhardt Ag Maschf | Kreuzkopfeinrichtung für den mechanischen Antrieb von Hochdruck-Kompressoren oder -Pumpen |
US3839946A (en) * | 1972-05-24 | 1974-10-08 | Hardie Tynes Mfg Co | Nonlubricated compressor |
US4230026A (en) * | 1978-10-25 | 1980-10-28 | Hartley E Dale | Reciprocating piston device |
GB2060785B (en) * | 1979-09-26 | 1983-11-23 | Hamworthy Engineering | Opposed piston machinery |
US4762051A (en) * | 1986-07-17 | 1988-08-09 | Dresser Industries, Inc. | Single acting pump with double acting drive |
US4729291A (en) * | 1986-07-18 | 1988-03-08 | Ingersoll-Rand Company | Gas compressor |
US4756674A (en) * | 1987-08-24 | 1988-07-12 | Ingersoll-Rand Company | Reciprocating gas compressor having a split housing and crosshead guide means |
NL8800036A (nl) * | 1988-01-08 | 1989-08-01 | Hendrikus Peter Van Der Waal | Pomp of motor met ten minste een in een cilinderboring aangebracht zuigerlichaam. |
US4931000A (en) * | 1989-03-02 | 1990-06-05 | Gilian Instrument Corp. | Double acting diaphragm air pump |
US5259256B1 (en) * | 1992-07-31 | 1995-06-13 | Douglas C Brackett | Motion converter with pinion sector/rack interface |
US5417309A (en) * | 1993-11-08 | 1995-05-23 | Brackett; Douglas C. | Lubrication system for a conjugate drive mechanism |
US5431130A (en) * | 1993-11-08 | 1995-07-11 | Brackett; Douglas C. | Internal combustion engine with stroke specialized cylinders |
US5375566A (en) * | 1993-11-08 | 1994-12-27 | Brackett; Douglas C. | Internal combustion engine with improved cycle dynamics |
US5351567A (en) * | 1993-11-08 | 1994-10-04 | Brackett Douglas C | Motion arrester for a conjugate drive mechanism |
US5445039A (en) * | 1994-03-18 | 1995-08-29 | Brackett; Douglas C. | Conjugate drive mechanism |
-
1996
- 1996-01-24 US US08/590,986 patent/US5638738A/en not_active Expired - Fee Related
-
1997
- 1997-01-21 EP EP97300358A patent/EP0786579A1/en not_active Ceased
- 1997-01-23 JP JP9009893A patent/JPH09209702A/ja active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR830293A (fr) * | 1936-12-15 | 1938-07-25 | Tilling Stevens Ltd | Moteur à cylindres diamétralement opposés |
US2310733A (en) * | 1942-03-25 | 1943-02-09 | Duke Charles Austin | Internal combustion engine |
US3200800A (en) * | 1962-04-27 | 1965-08-17 | Bois Francois M Du | Internal combustion engine |
DE2746203A1 (de) * | 1977-10-14 | 1979-04-19 | Bernhard Karl Dipl Ing | Verbrennungsmotor |
Also Published As
Publication number | Publication date |
---|---|
JPH09209702A (ja) | 1997-08-12 |
US5638738A (en) | 1997-06-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): DE FR GB IT SE |
|
17P | Request for examination filed |
Effective date: 19980120 |
|
17Q | First examination report despatched |
Effective date: 20000831 |
|
RTI1 | Title (correction) |
Free format text: PISTON TO CRANK LINKAGE FOR AIR MOTOR |
|
GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20011008 |